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Since the mid-90s, GRS has been dealing systematically with the assessment of the influences of ageing on the safety of nuclear power plants. This also involves the generic evaluation of operating experience. In the following, the procedure, methodological approaches and relevant results are presented in an exemplary manner for passive mechanical components. The results show that the number of events influenced by ageing phenomena that have so far occurred in German plants is low and that measures were taken where necessary to detect, monitor and control any changes due to ageing. As new insights may emerge over time concerning the assessment of the ageing behaviour of the components, it is considered necessary to continue with the ongoing generic evaluation of operating experience in order to obtain timely indications of any safety-relevant changes.

Generic evaluation of operating experience with regard to the ageing behaviour of passive mechanical components in nuclear power plants